Light colored coating composition



PATEN oF 3,989,711 LIGHT COLGRED COATING COMPOSITION Paul Robinson,Llanerch, and Ben E. Sorenson, Philadelphia, Pa, ore to E. I. du Pont deNemours & Company, Wilmington, Belt, is corporation of Delaware NoDrawing. Application August 2 1930 Serial No. male This inventionrelates to coating compositions to dry on the upper surface only,remaining soft and more particularly to those coating composion thesurface in contact with the article being tions based upon resinoussubstances combined coated for extended periods of time. Some of ormodified with drying oils or drying oil ccnthese driers are unstableinthe solutionsinwhich 5 stituents and more specifically to thosecoating they are used and precipitate out on standing 5 compositionsmade from oil modified polyhydric or on drying causing the surface ofthe film to alcohol-polybasic acid resins. be discontinuous and topresent a rough appear- Coating compositions based upon synthetic oleoance and sometimes a low gloss. resinous materials have been known forsome Attemptstosubstitute other oxidation catalysts time. Very usefulcoating compositions can be for metallic driers in compositionscontaining 10 made from phenol formaldehyde resins modified oils andcertain oleo resinous materials are not with rosin or other gums andincorporated into successful because the sufiiciently rapid dryingdrying oils. Exceedingly useful coating materials cannot be secured bythe combination obtained. can also be made from the oil modifiedpolyhydric To the best of our knowledge, however, organicalcohol-polybasic acid resins. Coating composidriers of the typedisclosed herein have not previ- 15 tions of this sort dry more rapidlythan correously been used to replace all or the major part sponding oleoresinous varnishes made from oils of the drier in oil modifiedpolyhydric alcohol-v and natural gums. With the use of any of thepolybasic acid resinous coating compositions as above mentionedmaterials, however, it has heremore fully hereinafter set forth.

2Q tofore been necessary to add to these composi- Thisinvention has asanobject the preparation tions metallic soaps or driers. These substancesof light colored coating compositions which shall are omdation catalystsfor the drying of oils. be initially very light in color and shallretain Their addition has been necessary in order to get their lightcolor for extended periods of time even sufiiciently rapid drying speedand at the same when exposedinunfavorable locations. Afurther 1 timesatisfactory durability and application propobject is to prepare lightcolored coating composi- 25 erties. These driers are for the most.part'soaps tions which will not undergo undesirable oxidaor oilssoluble salts of metals such asjlead, mantion on storage. A stillfurther object is to preganese an pare light colored coatingcompositions, the films A o e metallic fi ers very markedly inof whichwill dry evenly thruout their entire 1 crease the rate of dry orsynthetic resin composithickness. A still further object is to preparetions including the polyhydric alcohol-polybasic light colored'coatingcompositions which will be acid resin type their use is attended withnumerstable in the liquid condition and which will not ousdisadvantages. One of the disadvantages develop properties which willcause an uneven attending the use of these driers resides in the filmhaving a low degree of gloss. A still further fact that they are highlycolored and even in object is to prepare coating compositions which 35small amounts impart an objectionable dark color can be baked or forcedried without becoming to the product. This discoloration is moreseriseriously discolored. Additional objects will apous when thecoating, compositions are dried by pear hereinafter. baking rather thanby exposure to the air at room These objects are accomplished by thefollow- 40 temperatures. It also increases on exposure of ing inventionin which organic peroxides are inthe film in warm and dark locations outof con-- corporated into coating compositions made with tact with directlight. From a manufacturing oil modified polyhydric alcohol-polybasicacid standpoint the use of driers is also a disadvantage resins.

- in h it gives difficulty in mixing nd grinding We have found thatattempts to substitute oroperations causing the material to lump and toganic peroxides for metallic driers in coating com- 45 form skins. Thetendency to skin over the surpositions containing oils or oleo resinousvarnishes face, also appears when the materials are placed made fromnatural gums do not yield composiincontainers that are not completelyfilled. Many tions that dry at a sufficiently rapid rate to be of thesedriers give rise to rapid oxidation which usable. We have found,however, that organic 59 causes the films laid down from the composidonsperoxides when used in conjunction with polym hydric alcohol-polybasicacid resins, as described below, yieldcoating compositions which dry in.

them are described in the following examples:

Example 1 Titanium dioxide 10.00 Lithopone I 36.00 Zinc oxide 10.00 15Resin A 20.00 Mineral spirits 13.00 Benzoyl peroxide. 5.00

Example 2 Lithopone 40.00 Zinc oxide 8.90 25 -Resin A 1 30.80 Mineralspirits 13.80 Cobalt drier .04 Benzoyl peroxide 3.16

Example 3 Titanium dioxide 10.00 Lithopone 36.00 35 Zinc oxide 10.00Resin A 26.00 Mineral spirits 13.00 Dibutyl peroxide 5.00

Example 4 Lithopone 43.3 Zinc oxide 10.9 45. Resin A 12.8 Oil I A 14.0Benzoyl peroxide 5.2 Mineral spirits 13.8

Example 5 Lithop'one 43.3 Zinc oxide 10.9 5 Resin B 12.8 011 A 14.0Benzoyl peroxide 3.0 Turpentine 16.0

In the last two examples we used a blend of oil soluble resin and bodiedoil prepared in accordance with the method more fully set forth andclaimed in copending application oi! John W. Ilifl and Paul Robinson,Serial No. 462,408, filed lwJune 19. 1930. This method of preparing theblendis characterized by the fact that oil soluble are prepared andthese resins are dissolvedissue- 001a in the-bodied oil.

Thcoil designated A in Examples 4 and 5 was oiigkettle bodied in theabsence or air at temperature of 525 F. to a viscosity of about poises'.

- Example 6 Lithopone"; 42.30 Lead chromate 1.00 Zinc oxide 8.90 Resin AQ 30.80 Mineral spirits 13.80 Cobalt drier .04 Benzoyl peroxide 3.16

Example 7 A clear lacquer unusually light in color and re- Jsistant tocolor changes can be made from the following ingredients:

Resin B 50.0 Acetone 48.5 Benzoyl peroxide 1.5

The compositions oi polyhydric alcohol-polybasic acid resin referred toin the above examples are as follows:v

These resins are preferably made by heating the drying or semi-dryingoil with the glycerol or other polyhydric alcohols until the alcoholgoes into the solution in the oil. The mixture of glycerides so formedis then heated with phthalic anhydride, or other polybasic acid, untilesterificationv occurs.

Since the specific details of this method of making the resins forms nopart of the present invention, attention is directed to the co-pendingapplicationot Paul Robinson, Serial No. 370,727, filed June 13, 1929,for a fuller disclosure thereof. It is understood, however, that thepresent invention is not limited to this particular method or making theresins but other processes known to those skilled in the art may beused."

It is to be understood that the benzoyl peroxide or dibutyl peroxidementioned in the examples may be replaced by other organic peroxidessuch as dioleyl peroxide or dinitro dibenzoyl peroxide. Likewise, resinsmade with difierent polyhydric alcohols and polybasic acids, and withvarying proportions thereof, may be used instead or the specific resinsmentioned. It is desirable, however, in the practice of the presentinvention to keep the oil glyceride present in the resin from greatlyexceeding 65% because the composition will then dry too slowly tobesatisfactory for most purposes unless it also contains considerableamounts of metallic driers. Other oils such as China-wood oil may besubstituted for the linseed or "soya bean oil, although the advantagesof the meant in this case are also not so apparent since the oil acidsare dark colored.

It is to be understood that the term "oil modified polyhydricalcohol-polybasic acid resin mentioned in the claims refers to resinsmade by reacting, as indicated above, or in any suitable way, a fattyoil of the drying or semi-drying type, or the corresponding fatty oilacids, with a polybasic acidand a polyhydric alcohol.

As many apparently widely different embodiments of this invention may bemade without departing from the spirit and scope thereof, it is to beunderstood that we do not limit ourselves to in the appended claims.

We claim: 1. A rapid drying coating composition compris= ing an oilmodified polyhydric alcohol-polybasic acid resin and a drier for saidcomposition which comprises a major proportion of an organic peroxide,said resin being selected from the class consisting of drying andsemi-drying oil modified resins. 2; The composition set forth in claim 1in which the organic peroxide is selected from the class consisting ofbenzoyl peroxide, dibutyl peroxide, dioleyl peroxide and dinitrodibenzoyl peroxide 3. The coating composition set forth in claim 1 inwhichthe resin is a glyceryi phthalate resin.

PAUL ROBINSON. BEN E. SORENSON.

